<SEC-DOCUMENT>0001306830-21-000111.txt : 20210429
<SEC-HEADER>0001306830-21-000111.hdr.sgml : 20210429
<ACCEPTANCE-DATETIME>20210429161331
ACCESSION NUMBER:		0001306830-21-000111
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210427
FILED AS OF DATE:		20210429
DATE AS OF CHANGE:		20210429

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Hill Kathryn
		CENTRAL INDEX KEY:			0001533931

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32410
		FILM NUMBER:		21870727

	MAIL ADDRESS:	
		STREET 1:		7 WORLD TRADE CENTER
		STREET 2:		250 GREENWICH STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10007

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Celanese Corp
		CENTRAL INDEX KEY:			0001306830
		STANDARD INDUSTRIAL CLASSIFICATION:	PLASTIC MATERIAL, SYNTH RESIN/RUBBER, CELLULOS (NO GLASS) [2820]
		IRS NUMBER:				980420726
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		222 W. LAS COLINAS BLVD., SUITE 900N
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039-5421
		BUSINESS PHONE:		972-443-4000

	MAIL ADDRESS:	
		STREET 1:		222 W. LAS COLINAS BLVD., SUITE 900N
		CITY:			IRVING
		STATE:			TX
		ZIP:			75039-5421

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Celanese CORP
		DATE OF NAME CHANGE:	20041102

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Blackstone Crystal Holdings Capital Partners (Cayman) IV Ltd.
		DATE OF NAME CHANGE:	20041022
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_161972719175928.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-04-27</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001306830</issuerCik>
        <issuerName>Celanese Corp</issuerName>
        <issuerTradingSymbol>CE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001533931</rptOwnerCik>
            <rptOwnerName>Hill Kathryn</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CELANESE CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>222 W. LAS COLINAS BLVD., SUITE 900N</rptOwnerStreet2>
            <rptOwnerCity>IRVING</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75039</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-04-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>975</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10449</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Annual grant of restricted stock units pursuant to the Company's 2018 Global Incentive Plan.  The restricted stock units vest in full on the one-year anniversary of the date of the grant.  The reporting person has elected that upon vesting of the restricted stock units, receipt of the shares of Common Stock be deferred under the Company's 2008 Deferred Compensation Plan; accordingly, upon vesting, the reporting person will instead receive an equal number of shares of phantom stock.  As provided in the Company's 2008 Deferred Compensation Plan, the phantom stock becomes payable in shares of Common Stock upon the earlier of the date previously elected by the reporting person to receive payment or the termination of the reporting person's service as a director of the Company.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Adam R. Santosuosso, Attorney-in-Fact for Kathryn Hill</signatureName>
        <signatureDate>2021-04-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
